The gravimetric coal feeder is mostly used for the coal feeding and measurement of pulverizer system of thermal power plant. As microprocessor controls are adopted, it can precisely and reliably control the coal feed rate by weight, matching the demand for boiler combustion system, which can result in saving in fuel and increasing economic benefits. The gravimetric coal feeder is able to realize continuous and uniform coal feed. In the whole operation process, it can not only accurately weigh materials and display the instantaneous feed rate and total weight of material delivered but also adjust the coal feed rate according to the instructions of boiler combustion control system and control the coal feed rate to comply with the requirements of boiler load.